A circular saw includes a saw cover 13 covering an upper peripheral edge of a rotary blade 1 and a handle 12 disposed by being separated by a predetermined distance in an axial direction of the rotary blade 1 relative to the saw cover 13. A release part 40 for avoiding interference with a hand H gripping the handle 12 is provided at the saw cover 13 so that a wall surface of the saw cover 13 forming a chip discharge passage is shifted in position in a direction away from the handle 12 locally. A swelling part 41 having a swelled wall surface in a radial direction outer side is formed on the saw cover 13 at the axial direction opposite side of the rotary blade 1 relative to the release part 40.